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Collaboration Services 3.9.1 - Release Notes

Known issues

Exchange Online is not supported.


Modern Authentication is not supported.


The QCS Namespaces list may contain duplicate namespaces after installation. You can remove duplicate values manually.


The user interface may appear unresponsive when retrieving large quantities of data when the Collaboration Services server CPU usage is high. This happens because the user interface has the lowest priority and always yields to all other Collaboration Services processes.


ACSMAPIServ.exe service will not shut down which causes the Quest Collaboration Services Synchronization Service to become unresponsive.


When free/busy information is published to public folders, the current month is determined in GMT. This behavior is only applicable to Calendar synchronization.


Collection statistics may show incorrect information. This does not mean there are any errors in the synchronization. Please refer to Collaboration Services events for tracking synchronization issues.


Indexing service, antivirus on-access scanners, and any other software that interacts directly with the file system may lock Collaboration Services databases and cause synchronization failures. You must exclude the Storage subfolder in the Collaboration Services installation folder from the scope of such tools.


When upgrading the license to one for a different number of synchronized objects, you must perform a re-publication of all published collections.


System requirements

Hardware requirements


Intel x86-based computer

Pentium III or higher. Multi-processor configurations are recommended for the HQ forest server in large deployments.


A minimum of 2 GB RAM is required; 8 GB is recommended. Requirements for RAM depend on the total number of synchronized objects:

Less than 100,000 objects – 4 GB

100,000 to 300,000 objects – 8 GB

More than 300,000 objects – 16 GB

Hard disk space

A minimum of 80 GB of free disk space is required. Additional disk space requirements are as follows:

10 MB per every 1K of synchronized Active Directory objects

20 MB per every 1K of synchronized free/busy objects or Calendar objects

Operating system

One of the following:

Microsoft Windows Server 2003 SP 2 or later

Microsoft Windows Server 2003 R2

Microsoft Windows Server 2008

Microsoft Windows Server 2008 R2

Microsoft Windows Server 2012

Microsoft Windows Server 2012 R2

Microsoft Windows Server 2016

Microsoft Windows Server 2019

Additional software

Microsoft Exchange Server MAPI Client and Collaboration Data Objects 1.2.1 build 6.5.8320 or later

Outlook 2010 or later versions

Microsoft Internet Explorer 8.0 or later

Microsoft Windows Installer 2.0 or later

Collaboration Services supports the following Active Directory forest functional levels: Windows Server 2003, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016 and Windows Server 2019.

Exchange server requirements

Exchange server

Microsoft Exchange Server 2007 SP 1 or later

Microsoft Exchange Server 2010 SP1

Microsoft Exchange Server 2013

Microsoft Exchange Server 2016 CU6 or later: Works with Outlook 2013 or later versions.

Microsoft Exchange Server 2019

NOTE: For Exchange Server 2013 and later versions, you need to apply the RCAMaxConcurrency Unlimited Throttling Policy to the Collaboration Services Service Account.

To do so, run the following Exchange PowerShell commands:
New-ThrottlingPolicy QCSSAPolicy
Set-ThrottlingPolicy QCSSAPolicy -RCAMaxConcurrency Unlimited
Set-Mailbox -Identity <QCS service account ID> -ThrottlingPolicy QCSSAPolicy

To verify that the policy is applied successfully, run the following Exchange PowerShell command:
Get-Mailbox -Identity <QCS service account ID> | Get-ThrottlingPolicyAssociation
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